Rotary Printing Press Inking Unit Roller Arrangement
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Solution Overview
Problem
High-speed rotary printing machines face issues with ink misting and wear resistance due to the long roller train and high ink layer thickness, leading to reduced print quality and increased maintenance needs.
Innovation Solution
A film roller with a stochastic structure and a hardness of at least 60 Shore D, made from materials like polyamide or copper, is used in the inking unit, reducing ink misting and wear while maintaining high ink acceptance and release properties, and allowing for quick adaptation to ink metering changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a long roller train with multiple ink forme rollers is used to apply specific ink amounts, then ink metering precision is improved, but ink layer thickness becomes relatively high leading to increased ink misting
Solution Approach 1:
The ink application process is divided into multiple stages with separate rollers for different ink zones. Each roller applies ink to a specific section of the forme cylinder, allowing precise control of ink amounts in each zone while maintaining shorter individual roller trains that reduce ink misting.
Solution Approach 2:
Different rollers are used for different zones of the forme cylinder, with each roller optimized for its specific zone's ink metering requirements. This allows each roller to operate with optimal ink layer thickness for its local requirements rather than requiring uniformly high ink layer thickness throughout the entire roller train.
2Reliability
If conventional film roller materials are used in high-speed printing, then ink acceptance is maintained, but wear resistance is insufficient leading to frequent replacement
Solution Approach 1:
The film roller combines a hard, wear-resistant outer surface layer (made of materials like polyamide or copper with hardness of at least 60 Shore D) with an inner core that provides necessary flexibility and ink absorption properties. This composite structure achieves both wear resistance and functional performance.
Solution Approach 2:
The outer surface of the film roller is given a stochastic structure through shot peening, which changes the surface topology to improve wear resistance while maintaining ink acceptance properties. The hardness is increased to at least 60 Shore D through material selection and surface treatment.
3Object-generated harmful factors
If a short roller train is used to reduce ink misting, then ink metering control becomes difficult, but the problem of ink misting increases
Solution Approach 1:
The ink application system is segmented into multiple independent rollers, each responsible for a specific zone. This allows each roller to be part of a shorter train (reducing misting) while the collective system maintains precise overall ink metering control through zone-specific adjustment.
Solution Approach 2:
The rollers are equipped with adjustable radial stroke mechanisms that allow dynamic adjustment of contact pressure during operation. This enables precise ink metering control even with shorter roller trains by adjusting the pressure and interaction between rollers rather than relying solely on fixed geometric configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in improved print quality, reduced ink misting, longer service life of the film roller, and shorter washing times, meeting the demands of high-speed newspaper printing with minimal waste and efficient production.
Implementation Method 1
The lateral surface of the film roller (09) is structured by shot peening
Implementation Method 2
both friction rollers being positioned directly on the ink flow separating roller
Data Source
Figure 1
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AI summary
The invention relates to an arrangement in a printing unit of a rotary printing press, comprising at least a form cylinder (02), three ink application rollers (03; 04; 06), two friction rollers (12; 13) and an ink flow separator roller (11), wherein both friction rollers (12; 13) are each directly attached to the ink flow separator roller (11), wherein one of the ink application rollers (03) is attached to both one of the friction rollers (12) and to the form cylinder (02), wherein the other two ink application rollers (04; 06) are attached to both the other friction roller (13) and to the form cylinder (02), wherein an ink inductor (08) receiving printing ink from an ink reservoir (07) is provided, and wherein a dampening unit is provided. Each of the friction rollers (12; 13) is exclusively connected to the ink flow separator roller (11) and to at least one of the respective ink application rollers (03; 04;06) is positioned, wherein the uppermost ink application roller (06) is arranged such that a horizontal tangent (T06) applied to the circumference of this ink application roller (06) is located at a vertical distance (a06) of at least 50 mm from a horizontal tangent (T02) applied to the circumference of the form cylinder (02), wherein the respective axis of rotation of all rollers (03; 04; 06; 08; 09; 11; 12; 13) transporting printing ink to the form cylinder (02) is arranged vertically spaced below the horizontal tangent (T06) applied to the circumference of the uppermost ink application roller (06), wherein the dampening unit associated with the form cylinder (02) has several rollers (18; 21; 22), wherein the respective axis of rotation of all rollers (18; 21;22) of the dampening system is arranged essentially vertically spaced below a plane defined by the respective axes of rotation of the mold cylinder (02) and a transfer cylinder (01) cooperating with this mold cylinder (02).;